glibc/locale/setlocale.c

406 lines
11 KiB
C

/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <locale.h>
#include <langinfo.h>
#include "localeinfo.h"
/* For each category declare two external variables (with weak references):
extern const struct locale_data *_nl_current_CATEGORY;
This points to the current locale's in-core data for CATEGORY.
extern const struct locale_data _nl_C_CATEGORY;
This contains the built-in "C"/"POSIX" locale's data for CATEGORY.
Both are weak references; if &_nl_current_CATEGORY is zero,
then nothing is using the locale data. */
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
extern const struct locale_data *_nl_current_##category; \
extern const struct locale_data _nl_C_##category; \
/* XXX The linker is broken so we cannot do the weak symbols right just now. */
/* weak_symbol (_nl_current_##category) weak_symbol (_nl_C_##category) */
#include "categories.def"
#undef DEFINE_CATEGORY
/* Array indexed by category of pointers to _nl_current_CATEGORY slots.
Elements are zero for categories whose data is never used. */
const struct locale_data * *const _nl_current[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[category] = &_nl_current_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* Array indexed by category of pointers to _nl_C_CATEGORY slots.
Elements are zero for categories whose data is never used. */
const struct locale_data *const _nl_C[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[category] = &_nl_C_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* Define an array of category names (also the environment variable names),
indexed by integral category. */
const char *const _nl_category_names[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[category] = category_name,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* An array of their lengths, for convenience. */
const size_t _nl_category_name_sizes[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[category] = sizeof (category_name) - 1,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* Declare the postload functions used below. */
#undef NO_POSTLOAD
#define NO_POSTLOAD _nl_postload_ctype /* Harmless thing known to exist. */
#define DEFINE_CATEGORY(category, category_name, items, postload, b, c, d) \
extern void postload (void);
#include "categories.def"
#undef DEFINE_CATEGORY
#undef NO_POSTLOAD
/* Define an array indexed by category of postload functions to call after
loading and installing that category's data. */
void (*const _nl_category_postload[]) (void) =
{
#define DEFINE_CATEGORY(category, category_name, items, postload, b, c, d) \
[category] = postload,
#include "categories.def"
#undef DEFINE_CATEGORY
};
const char _nl_C_name[] = "C";
/* Name of current locale for each individual category.
Each is malloc'd unless it is nl_C_name. */
const char *_nl_current_names[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
_nl_C_name,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* Composite LC_ALL name for current locale.
This is malloc'd unless it's _nl_C_name. */
char *_nl_current_composite_name = (char *) _nl_C_name;
/* Switch to the locale called NAME in CATEGORY. Return a string
describing the locale. This string can be used as the NAME argument in
a later call. If NAME is NULL, don't switch locales, but return the
current one. If NAME is "", switch to a locale based on the environment
variables, as per POSIX. Return NULL on error. */
char *
setlocale (int category, const char *name)
{
/* Return a malloc'd copy of STRING. */
char *copy (const char *string)
{
size_t len = strlen (string) + 1;
char *new = malloc (len);
return new ? memcpy (new, string, len) : NULL;
}
/* Construct a new composite name. */
char *new_composite_name (int category, char *newnames[LC_ALL])
{
size_t lens[LC_ALL], cumlen = 0;
int i;
char *new, *p;
int same = 1;
for (i = 0; i < LC_ALL; ++i)
{
char *name = (category == LC_ALL ? newnames[i] :
category == i ? newnames[0] :
(char *) _nl_current_names[i]);
lens[i] = strlen (name);
cumlen += _nl_category_name_sizes[i] + 1 + lens[i] + 1;
if (i > 0 && same && strcmp (name, newnames[0]))
same = 0;
}
if (same)
{
/* All the categories use the same name. */
new = malloc (lens[0] + 1);
if (! new)
{
if (!strcmp (newnames[0], "C") || !strcmp (newnames[0], "POSIX"))
return (char *) _nl_C_name;
return NULL;
}
memcpy (new, newnames[0], lens[0] + 1);
return new;
}
new = malloc (cumlen);
if (! new)
return NULL;
p = new;
for (i = 0; i < LC_ALL; ++i)
{
/* Add "CATEGORY=NAME;" to the string. */
char *name = (category == LC_ALL ? newnames[i] :
category == i ? newnames[0] :
(char *) _nl_current_names[i]);
memcpy (p, _nl_category_names[i], _nl_category_name_sizes[i]);
p += _nl_category_name_sizes[i];
*p++ = '=';
memcpy (p, name, lens[i]);
p += lens[i];
*p++ = ';';
}
p[-1] = '\0'; /* Clobber the last ';'. */
return new;
}
/* Put COMPOSITE in _nl_current_composite_name and free the old value. */
void setcomposite (char *composite)
{
char *old = _nl_current_composite_name;
_nl_current_composite_name = composite;
if (old != _nl_C_name)
free (old);
}
/* Put NAME in _nl_current_names and free the old value. */
void setname (int category, const char *name)
{
const char *oldname = _nl_current_names[category];
_nl_current_names[category] = name;
if (oldname != _nl_C_name)
free ((char *) oldname);
}
/* Put DATA in *_nl_current[CATEGORY] and free the old value. */
void setdata (int category, struct locale_data *data)
{
if (_nl_current[category])
{
const struct locale_data *olddata = *_nl_current[category];
*_nl_current[category] = data;
if (_nl_category_postload[category])
(*_nl_category_postload[category]) ();
if (olddata != _nl_C[category])
_nl_free_locale ((struct locale_data *) olddata);
}
}
const char *current_name;
char *composite;
if (category < 0 || category > LC_ALL)
{
errno = EINVAL;
return NULL;
}
if (category == LC_ALL)
current_name = _nl_current_composite_name;
else
current_name = _nl_current_names[category];
if (name == NULL)
/* Return the name of the current locale. */
return (char *) current_name;
if (name == current_name)
/* Changing to the same thing. */
return (char *) current_name;
if (category == LC_ALL)
{
const size_t len = strlen (name) + 1;
char *newnames[LC_ALL];
char *p;
struct locale_data *newdata[LC_ALL];
/* Set all name pointers to the argument name. */
for (category = 0; category < LC_ALL; ++category)
newnames[category] = (char *) name;
p = strchr (name, ';');
if (p)
{
/* This is a composite name. Make a local copy and split it up. */
int i;
char *n = alloca (len);
memcpy (n, name, len);
while ((p = strchr (n, '=')) != NULL)
{
for (i = 0; i < LC_ALL; ++i)
if (_nl_category_name_sizes[i] == p - n &&
!memcmp (_nl_category_names[i], n, p - n))
break;
if (i == LC_ALL)
{
/* Bogus category name. */
errno = EINVAL;
return NULL;
}
if (i < LC_ALL)
{
/* Found the category this clause sets. */
char *end = strchr (++p, ';');
newnames[i] = p;
if (end)
{
/* Examine the next clause. */
*end = '\0';
n = end + 1;
}
else
/* This was the last clause. We are done. */
break;
}
}
for (i = 0; i < LC_ALL; ++i)
if (newnames[i] == name)
/* The composite name did not specify all categories. */
return NULL;
}
/* Load the new data for each category. */
while (category-- > 0)
/* Only actually load the data if anything will use it. */
if (_nl_current[category])
{
newdata[category] = _nl_load_locale (category,
&newnames[category]);
if (newdata[category])
newnames[category] = copy (newnames[category]);
if (! newdata[category] || ! newnames[category])
{
if (!strcmp (newnames[category], "C") ||
!strcmp (newnames[category], "POSIX"))
{
/* Loading from a file failed, but this is a request
for the default locale. Use the built-in data. */
if (! newdata[category])
newdata[category]
= (struct locale_data *) _nl_C[category];
newnames[category] = (char *) _nl_C_name;
}
else
{
/* Loading this part of the locale failed.
Abort the composite load. */
abort_composite:
while (++category < LC_ALL)
{
if (_nl_current[category])
_nl_free_locale (newdata[category]);
if (newnames[category] != _nl_C_name)
free (newnames[category]);
}
return NULL;
}
}
}
else
{
/* The data is never used; just change the name. */
newnames[category] = copy (newnames[category]);
if (! newnames[category])
{
if (!strcmp (newnames[category], "C") ||
!strcmp (newnames[category], "POSIX"))
newnames[category] = (char *) _nl_C_name;
else
{
while (++category < LC_ALL)
if (newnames[category] != _nl_C_name)
free (newnames[category]);
}
}
}
composite = new_composite_name (LC_ALL, newnames);
if (! composite)
{
category = -1;
goto abort_composite;
}
/* Now we have loaded all the new data. Put it in place. */
for (category = 0; category < LC_ALL; ++category)
{
setdata (category, newdata[category]);
setname (category, newnames[category]);
}
setcomposite (composite);
return composite;
}
else
{
char *newname = copy (name);
if (! newname)
{
if (!strcmp (name, "C") || !strcmp (name, "POSIX"))
newname = (char *) _nl_C_name;
else
return NULL;
}
composite = new_composite_name (category, &newname);
if (! composite)
{
if (newname != _nl_C_name)
free (newname);
return NULL;
}
/* Only actually load the data if anything will use it. */
if (_nl_current[category])
{
struct locale_data *newdata = _nl_load_locale (category,
(char **) &name);
if (! newdata)
{
if (!strcmp (name, "C") || !strcmp (name, "POSIX"))
newdata = (struct locale_data *) _nl_C[category];
else
return NULL;
}
setdata (category, newdata);
}
setname (category, newname);
setcomposite (composite);
return newname;
}
}